The idea of numbering from 0 (in nonprogramming contexts) as a sort of
hacker shibboleth appears to be a 1980s joke that is rooted in an
erroneous overgeneralization from C syntax. I am prepared to revert
this change if someone can demonstrate for me that "counting from
zero" has some sort of techno-cultural basis outside of traditions
established by C programmers.

At least some proto-versions of the GNU GPL (preceding GPLv1) began
section numbering from 1. See, e.g.:
http://www.free-soft.org/gpl_history/emacs_gpl.html

To my knowledge, all FLOSS licenses outside the GNU license tradition
with numbered sections number them from 1, not 0.